Peptide Plugs scores a little higher on our transparency method (8.1 vs 7.8), mostly on business disclosure. Both vendors ship from Texas and give you a code to check their certificates on the lab's own site. Peptide Plugs publishes its LLC and street address. Blank Peptides has the tighter lot-level paperwork: a lot number on every vial, a lookup page and a separate endotoxin report for each current lot, plus our 10% code. Neither has independent Finnrick data. Blank Peptides is #4 and Peptide Plugs #6 in our editors' order, which isn't sorted by score.
Notice: Research peptides are sold for in-vitro laboratory research only. They are not FDA-approved, not for human or animal consumption, and this page is not medical advice. This comparison covers supplier transparency only, based on public documentation. We didn't purchase or test products.
Side-by-side
| Blank Peptides | Peptide Plugs | |
|---|---|---|
| Transparency score (method) | 7.8 | 8.1 |
| Overall score | 7.8 | 7.5 |
| Entity and address | No entity; Sheridan, WY mailing address | Austin Research Products LLC, Liberty Hill, TX |
| Domain registered | March 2026 (site claims 2021) | December 2025 |
| Labs | Horizon Analytical, Freedom Diagnostics | Freedom Diagnostics |
| Lab-side check | Report number on Horizon's site | Accession code on Freedom's COA search |
| COA library | 232 certificates, by lot | 117 dated certificates, 62 products |
| Lot on vial + lookup | Yes | Lot on product pages |
| Endotoxin | Separate report per current lot | Not a standard part of the library |
| Finnrick | No profile | Profile, 0 tests |
| Labeling issues | "Sexual Health" category | "Weight Loss," "Anti-Aging" categories; a code-named GLP blend |
| Ships to | US and international | US only |
| Free shipping | Over $200 | Over $200 (UPS) |
| Returns | 14 days, unopened | All sales final |
| Coupon code | CHECKED, 10% off | None found |
Certificates you can check at the lab
This is what both do well. Peptide Plugs shows a lot, an accession code and a link to Freedom Diagnostics' own COA search on each product page (review). Blank Peptides shows the lab report number with a note to search it at horizonanalytical.com. Its BPC-157 report showed 99.4% purity and 9.82 mg in a 10 mg vial, and a matching endotoxin report showed under 0.05 EU/mL (review).
Blank goes further on lots and endotoxin. Peptide Plugs' main COA page shows no lot numbers. Blank's paperwork has its own gaps: a sterility claim we couldn't find a report for, and two CJC-1295 products sharing a lot.
Business transparency: Peptide Plugs is clearer
Peptide Plugs publishes Austin Research Products LLC and a Liberty Hill, TX address. Blank Peptides gives a Wyoming mailing address, says it ships from Texas and names no entity, and its "since 2021" claim doesn't match its March 2026 domain.
Labeling
Blank has the stricter framing: real compound names, no dosing content and an explicit no-protocol policy. Peptide Plugs keeps strict research-use text but sorts its shop into "Weight Loss," "Anti-Aging" and "Sleep" and sells a GLP-class blend under a code.
Shipping and returns
Both offer free shipping over $200. Blank ships internationally and accepts unopened returns within 14 days; Peptide Plugs ships in the US only and treats all sales as final.
Which should you choose?
- Choose Blank Peptides for an endotoxin report per lot, a lot on every vial, international shipping, returns and a 10% code (CHECKED). Visit Blank Peptides.
- Choose Peptide Plugs if a published LLC and street address matter most. Visit Peptide Plugs.
Related
- Reviews: Blank Peptides, Peptide Plugs
- More comparisons: Blank Peptides vs NextGenPeps, Peptide Plugs vs American Peptides
- Third-party tested peptides · vendor testing tracker